Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1451
PUT
Green Plains
GPRE
$1.19B
| $3.75M | ﹤0.01% |
111,500
+111,189
| +35,752% | +$3.32M |
|
1452
CALL
Smith & Wesson
SWBI
$655M
| $3.74M | ﹤0.01% |
108,000
+107,573
| +25,193% | +$2.25M |
|
1453
Qorvo
QRVO
$7.63B
| $3.74M | ﹤0.01% |
19,116
+7,583
| +66% | +$1.4M |
|
1454
PUT
Williams-Sonoma
WSM
$26.7B
| $3.73M | ﹤0.01% |
+46,800
| New | +$3.98M |
|
1455
PUT
First Majestic Silver
AG
$8.05B
| $3.73M | ﹤0.01% |
236,100
+234,668
| +16,387% | +$3.91M |
|
1456
PUT
EPAM Systems
EPAM
$4.69B
| $3.73M | ﹤0.01% |
7,300
+7,207
| +7,749% | +$3.38M |
|
1457
CALL
Crocs
CROX
$6.69B
| $3.73M | ﹤0.01% |
32,000
+31,659
| +9,284% | +$3.12M |
|
1458
CALL
Brinker International
EAT
$8.02B
| $3.72M | ﹤0.01% |
60,200
+60,047
| +39,246% | +$3.8M |
|
|
MNDT
1459
PUT
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $3.72M | ﹤0.01% |
184,100
+181,780
| +7,835% | +$3.73M |
|
|
ATCO
1460
CALL
DELISTED
Atlas Corp.
ATCO
| $3.71M | ﹤0.01% |
+260,600
| New | +$3.62M |
|
1461
CALL
Park Hotels & Resorts
PK
$2.97B
| $3.71M | ﹤0.01% |
180,000
+178,815
| +15,090% | +$3.83M |
|
1462
PUT
T. Rowe Price
TROW
$25B
| $3.7M | ﹤0.01% |
18,700
+18,516
| +10,063% | +$3.46M |
|
1463
CALL
Darling Ingredients
DAR
$9.93B
| $3.7M | ﹤0.01% |
54,800
+54,437
| +14,996% | +$3.83M |
|
1464
CALL
SBA Communications
SBAC
$18.4B
| $3.7M | ﹤0.01% |
+11,600
| New | +$3.48M |
|
1465
PUT
Silicon Motion
SIMO
$9.19B
| $3.69M | ﹤0.01% |
57,600
+57,159
| +12,961% | +$3.76M |
|
1466
PUT
Nasdaq
NDAQ
$52.1B
| $3.69M | ﹤0.01% |
+63,000
| New | +$3.47M |
|
|
OZON
1467
PUT
DELISTED
Ozon Holdings PLC American Depositary Shares, each ADS representing one ordinary share
OZON
| $3.69M | ﹤0.01% |
62,900
+62,137
| +8,144% | +$3.62M |
|
1468
PUT
MKS Inc
MKSI
$22.2B
| $3.68M | ﹤0.01% |
20,700
+20,661
| +52,977% | +$3.75M |
|
1469
CALL
Tanger
SKT
$4.82B
| $3.68M | ﹤0.01% |
+195,300
| New | +$3.43M |
|
|
MAXR
1470
CALL
DELISTED
Maxar Technologies Inc. Common Stock
MAXR
| $3.68M | ﹤0.01% |
92,100
+91,144
| +9,534% | +$3.24M |
|
1471
PUT
InMode
INMD
$872M
| $3.67M | ﹤0.01% |
77,600
+76,534
| +7,180% | +$3.25M |
|
1472
PUT
Dillards
DDS
$8.87B
| $3.67M | ﹤0.01% |
+20,300
| New | +$2.62M |
|
1473
CALL
Wheaton Precious Metals
WPM
$50.6B
| $3.67M | ﹤0.01% |
83,300
+82,661
| +12,936% | +$3.68M |
|
1474
PUT
Verisk Analytics
VRSK
$26.4B
| $3.67M | ﹤0.01% |
21,000
+20,781
| +9,489% | +$3.69M |
|
1475
PUT
Labcorp
LH
$24.3B
| $3.67M | ﹤0.01% |
15,481
+15,184
| +5,112% | +$3.46M |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,250 new positions and closed 1,197 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.